function Getfllproto(){
    this.bannernav = document.getElementsByClassName("banner_nav")[0];
    this.navul = document.getElementsByClassName("nav_ul")[0];
}

Getfllproto.prototype.init = function(){
    this.onMouseover();
}

Getfllproto.prototype.onMouseover = function(){

}

new Getfllproto().init();